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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d97917076cc07aaed6a099966bffeb407b38f98cca2b877ee766ff2de9e630' 
  AND token = 'aidmkw9QfC0ufgdolR6oiJ7ex0HZTM8kHkgbEsgFQ7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}